moonbridge

annotate moonbridge_http.lua @ 160:573995950b0b

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Restarted work on new HTTP module implementation
author jbe
date Thu Jun 11 00:49:54 2015 +0200 (2015-06-11)
parents bd7225b30391
children d5b8295d035e
rev   line source
jbe@0 1 #!/usr/bin/env lua
jbe@0 2
jbe@0 3 -- module preamble
jbe@0 4 local _G, _M = _ENV, {}
jbe@0 5 _ENV = setmetatable({}, {
jbe@0 6 __index = function(self, key)
jbe@0 7 local value = _M[key]; if value ~= nil then return value end
jbe@0 8 return _G[key]
jbe@0 9 end,
jbe@63 10 __newindex = _M
jbe@0 11 })
jbe@0 12
jbe@0 13 -- function that encodes certain HTML entities:
jbe@0 14 -- (not used by the library itself)
jbe@0 15 function encode_html(text)
jbe@0 16 return (
jbe@0 17 string.gsub(
jbe@0 18 text, '[<>&"]',
jbe@0 19 function(char)
jbe@0 20 if char == '<' then
jbe@0 21 return "&lt;"
jbe@0 22 elseif char == '>' then
jbe@0 23 return "&gt;"
jbe@0 24 elseif char == '&' then
jbe@0 25 return "&amp;"
jbe@0 26 elseif char == '"' then
jbe@0 27 return "&quot;"
jbe@0 28 end
jbe@0 29 end
jbe@0 30 )
jbe@0 31 )
jbe@0 32
jbe@0 33 end
jbe@0 34
jbe@0 35 -- function that encodes special characters for URIs:
jbe@0 36 -- (not used by the library itself)
jbe@0 37 function encode_uri(text)
jbe@0 38 return (
jbe@0 39 string.gsub(text, "[^0-9A-Za-z_%.~-]",
jbe@0 40 function (char)
jbe@0 41 return string.format("%%%02x", string.byte(char))
jbe@0 42 end
jbe@0 43 )
jbe@0 44 )
jbe@0 45 end
jbe@0 46
jbe@0 47 -- function undoing URL encoding:
jbe@0 48 do
jbe@0 49 local b0 = string.byte("0")
jbe@0 50 local b9 = string.byte("9")
jbe@0 51 local bA = string.byte("A")
jbe@0 52 local bF = string.byte("F")
jbe@0 53 local ba = string.byte("a")
jbe@0 54 local bf = string.byte("f")
jbe@0 55 function decode_uri(str)
jbe@0 56 return (
jbe@0 57 string.gsub(
jbe@0 58 string.gsub(str, "%+", " "),
jbe@0 59 "%%([0-9A-Fa-f][0-9A-Fa-f])",
jbe@0 60 function(hex)
jbe@0 61 local n1, n2 = string.byte(hex, 1, 2)
jbe@0 62 if n1 >= b0 and n1 <= b9 then n1 = n1 - b0
jbe@0 63 elseif n1 >= bA and n1 <= bF then n1 = n1 - bA + 10
jbe@0 64 elseif n1 >= ba and n1 <= bf then n1 = n1 - ba + 10
jbe@0 65 else error("Assertion failed") end
jbe@0 66 if n2 >= b0 and n2 <= b9 then n2 = n2 - b0
jbe@0 67 elseif n2 >= bA and n2 <= bF then n2 = n2 - bA + 10
jbe@0 68 elseif n2 >= ba and n2 <= bf then n2 = n2 - ba + 10
jbe@0 69 else error("Assertion failed") end
jbe@0 70 return string.char(n1 * 16 + n2)
jbe@0 71 end
jbe@0 72 )
jbe@0 73 )
jbe@0 74 end
jbe@0 75 end
jbe@0 76
jbe@0 77 -- status codes that carry no response body (in addition to 1xx):
jbe@0 78 -- (set to "zero_content_length" if Content-Length header is required)
jbe@0 79 status_without_response_body = {
jbe@5 80 ["101"] = true, -- list 101 to allow protocol switch
jbe@0 81 ["204"] = true,
jbe@0 82 ["205"] = "zero_content_length",
jbe@0 83 ["304"] = true
jbe@0 84 }
jbe@0 85
jbe@154 86 -- parses URL encoded form data:
jbe@154 87 local function read_urlencoded_form(data)
jbe@154 88 local tbl = {}
jbe@154 89 for rawkey, rawvalue in string.gmatch(data, "([^?=&]*)=([^?=&]*)") do
jbe@154 90 local key = decode_uri(rawkey)
jbe@154 91 local value = decode_uri(rawvalue)
jbe@154 92 local subtbl = tbl[key]
jbe@154 93 if subtbl then
jbe@154 94 subtbl[#subtbl+1] = value
jbe@154 95 else
jbe@154 96 tbl[key] = {value}
jbe@35 97 end
jbe@35 98 end
jbe@154 99 return tbl
jbe@0 100 end
jbe@0 101
jbe@154 102 -- extracts first value from each subtable:
jbe@154 103 local function get_first_values(tbl)
jbe@154 104 local newtbl = {}
jbe@154 105 for key, subtbl in pairs(tbl) do
jbe@154 106 newtbl[key] = subtbl[1]
jbe@0 107 end
jbe@154 108 return newtbl
jbe@154 109 end
jbe@154 110
jbe@160 111 function generate_handler(handler, options)
jbe@160 112 -- swap arguments if necessary (for convenience):
jbe@160 113 if type(handler) ~= "function" and type(options) == "function" then
jbe@160 114 handler, options = options, handler
jbe@160 115 end
jbe@160 116 -- helper function to process options:
jbe@160 117 local function default(name, default_value)
jbe@160 118 local value = options[name]
jbe@160 119 if value == nil then
jbe@160 120 return default_value
jbe@160 121 else
jbe@160 122 return value or nil
jbe@159 123 end
jbe@160 124 end
jbe@0 125 -- process options:
jbe@0 126 options = options or {}
jbe@160 127 local preamble = "" -- preamble sent with every(!) HTTP response
jbe@0 128 do
jbe@0 129 -- named arg "static_headers" is used to create the preamble:
jbe@0 130 local s = options.static_headers
jbe@0 131 local t = {}
jbe@0 132 if s then
jbe@0 133 if type(s) == "string" then
jbe@0 134 for line in string.gmatch(s, "[^\r\n]+") do
jbe@0 135 t[#t+1] = line
jbe@0 136 end
jbe@0 137 else
jbe@0 138 for i, kv in ipairs(options.static_headers) do
jbe@0 139 if type(kv) == "string" then
jbe@0 140 t[#t+1] = kv
jbe@0 141 else
jbe@0 142 t[#t+1] = kv[1] .. ": " .. kv[2]
jbe@0 143 end
jbe@0 144 end
jbe@0 145 end
jbe@0 146 end
jbe@0 147 t[#t+1] = ""
jbe@160 148 preamble = table.concat(t, "\r\n")
jbe@159 149 end
jbe@160 150 local input_chunk_size = options.maximum_input_chunk_size or options.chunk_size or 16384
jbe@160 151 local output_chunk_size = options.minimum_output_chunk_size or options.chunk_size or 1024
jbe@160 152 local header_size_limit = options.header_size_limit or 1024*1024
jbe@160 153 local body_size_limit = options.body_size_limit or 64*1024*1024
jbe@160 154 local request_idle_timeout = default("request_idle_timeout", 330)
jbe@160 155 local request_header_timeout = default("request_header_timeout", 30)
jbe@160 156 local request_body_timeout = default("request_body_timeout", 60)
jbe@160 157 local request_response_timeout = default("request_response_timeout", 1800)
jbe@160 158 local poll = options.poll_function or moonbridge_io.poll
jbe@160 159 -- return socket handler:
jbe@160 160 return function(socket)
jbe@160 161 local socket_set = {[socket] = true} -- used for poll function
jbe@160 162 local survive = true -- set to false if process shall be terminated later
jbe@160 163 local consume -- function that reads some input if possible
jbe@160 164 -- function that drains some input if possible:
jbe@160 165 local function drain()
jbe@160 166 local bytes, status = assert(socket:drain_nb(input_chunk_size))
jbe@160 167 if status == "eof" then
jbe@160 168 consume = nil
jbe@159 169 end
jbe@159 170 end
jbe@160 171 local function unblock()
jbe@160 172 if consume then
jbe@160 173 poll(socket_set, socket_set)
jbe@160 174 consume()
jbe@160 175 else
jbe@160 176 poll(nil, socket_set)
jbe@38 177 end
jbe@154 178 end
jbe@160 179 repeat
jbe@160 180 local request = {
jbe@160 181 socket = socket,
jbe@160 182 cookies = {}
jbe@160 183 }
jbe@160 184 local function send(...)
jbe@160 185 assert(socket:write_call(unblock, ...))
jbe@156 186 end
jbe@160 187 -- wait for input:
jbe@160 188 if not poll(socket_set, nil, request_idle_timeout) then
jbe@160 189 -- TODO: send error
jbe@160 190 return survive
jbe@156 191 end
jbe@160 192 until connection_close_responded
jbe@160 193 return survive
jbe@156 194 end
jbe@154 195 end
jbe@154 196
jbe@0 197 return _M
jbe@0 198

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